Nikon had something like this (the "Image Authentication System", which used a builtin key to sign the images) but somebody managed to pull the signing key off

Nikon had something like this (the "Image Authentication System", which used a builtin key to sign the images) but somebody managed to pull the signing key off the camera: https://blog.elcomsoft.com/2011/04/nikon-image-authentication-system-compromised/ https://blog.elcomsoft.com/2011/04/nikon-image-authenticatio... Same thing happened with Canon's implementation the year before.